Low amplitude can occur for various reasons, one of which can be a dirty movement. Same goes for very high amplitude, if accompanied by other factors could be a weakening of the hairspring or a worn pallet fork ( if accompanied by enough BE ) Really too many possibilities to list here. Which is why a timegrapher is of little use if you don't have the watch in your hand to examine. It is only meant to be a small part of the story of what is going on in the movement. As a tool it is very far from diagnostic.
Given though that this is a new movement and that this is probably the first time it has run at all. Those readings suggest the movement probably Ok. But that is all it does. You could swap the watch for one showing an amp of 275 , 0 BE and + - 1 sec and it could run very differently after a week. There is nothing about those readings which on their own suggest any kind of problem with that watch movement.
